How to position the GWT dialog to the bottom right corner of the browser?

I want to position the GWT dialog to the bottom right corner of the browser. There a fixed footer in my website (height=50px) & I want dialog to be shown as in the following pic.

Look at this code:

    int browserHeight=Window.getClientHeight();

    int browserWidth=Window.getClientWidth();

    dialog.setPopupPosition(browserWidth-dialog.getElement().getClientWidth(), browserHeight-dialog.getElement().getClientHeight());

    dialog.show();

The above code will make the position starts from the very last pixel of the browser (ie bottom=0 & right=0), which is not what i expect. Also, I don't like to use css cos browser incompatible problem.

so, How to position (via coding) the GWT dialog to the bottom right corner of the browser?

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